One of the major lacking features in the newest Office: no Metro applications. In fact, the only reason Windows RT has a desktop at all is because the Office team was unable to create Metro applications in time for the release of Windows RT. I often thought this was a classic case of two important divisions within Microsoft not getting along and not being aligned, but now that I have my own Surface RT, I'm starting to realise that there's a far simpler, and thus more likely, explanation: Metro is simply not ready for anything serious - or for anything at all, really.

Yeah, Windows RT apparently does not support the low power 5th core in the Tegra3. Which is why they used the lower clock frequency to reduce overall power consumption. Basically MS used a brute force HW approach to deal with the shortcomings of their own OS scheduler. I assume Microsoft had to get something out of the door pronto, before the iPad or Android get entrenched further.